[PATCH] top/maint.mk: improved regex parser used in update-NEWS-hash

[Peter Simons]

The original version required a very specific spelling of the line:

  old_NEWS_hash = foobar

In particular, it didn't allow for \t to be used instead of blanks, and
it didn't recognize the simply-expanded assignment operator ':='.
---
 top/maint.mk |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/top/maint.mk b/top/maint.mk
index 228b414..c3e2f47 100644
--- a/top/maint.mk
+++ b/top/maint.mk
@@ -492,7 +492,7 @@ sc_immutable_NEWS:
 # Update the hash stored above.  Do this after each release and
 # for any corrections to old entries.
 update-NEWS-hash: NEWS
-       perl -pi -e 's/^(old_NEWS_hash = ).*/$${1}'"$(NEWS_hash)/" \
+       perl -pi -e 's/^(old_NEWS_hash[ \t]+:?=[ \t]+).*/$${1}'"$(NEWS_hash)/" \
          $(srcdir)/cfg.mk
 
 # Ensure that we use only the standard $(VAR) notation,
-- 
1.6.3.3